Electrode structure



Nov. 26, 1940. J. KURTZ 2,222,669

ELECTRODE STRUCTURE Filed Nov. 9, 1959 14 3 I a 1! 15 vi15 INVENTORJZzoofifiizrZz ATTORNEY Patented Nov. 26, 1940 PATENT OFFICE .222.069ammonia srnucruaa I JaoobKurtn'leanechN.J.,amignortoEisler ElectricOorporaflon, Union City, N. 1., a corporation of Delaware ApplicationNovember 9, i939, No. 303,561

4 Claims. (01- 176-126) This invention relates to new and usefulimprovements in electrode structures for electrical discharge devices.

The object o! the invention is. an electrode assembly which may bemounted in an envelope without any special centering or spacing devicesother than wires serving as leading-in conductors.

With this object in view, three embodiments will be described forthe-purpose of exemplifying m the invention.

In the drawing Fig. 1 is aside elevation of a discharge tube of aconventional type in which the electrode structures of the presentinvention may be mounted;

it and Figs. 2, 3 and 4 are perspective views of three embodiments ofthe present invention.

Referring to Fig. 1, I is a glass envelope enclosing electrodes 2 and'2'. The electrodes are metal go cylinders closed at the bottom wherelead-in wires such as 3 and 4 are welded thereto. Wires 3 and 4 areeither of the same kind of metal as the electrodes or of one which maybereadily welded thereto and are sealable into the wall of the glass asenvelope as indicated at 5. The bottom of the electrode should be asclose as possible to the "press 5. By virtue of the construction to bepresently described, the conductors 3 and 4 serve not only as lead-inwires but also as the sole supports for the electrode and the sole meansfor properly positioning it, e. g., with respect to the envelope I. I

As shown in Fig. 2. the lead-in conductors 3 and 4 are constituted by asingle wire bent into a 35 U the connecting portion of which isflattened as shown at 6. The closed bottom of the electrode is welded tothe flattened portion at two points 1.

This will insure a firm support for the electrode in axial alignmentwith the legs 3 and 4 of the U.

Q When legs 3 and 4 are sealed at 5 into the envelope, the electrode 2will be centered within the glass tube l and it will not be necessary toprovide special centering means or protectors to prevent contact betweenthe electrode and the 45 glass envelope. This is insured by the securingof the electrodeto a flat instead of a rounded surface and by theprovision of a plurality of leading-in wires for each electrode.

Current supply may be eflected through either 50 leg 3 or 4.

The embodiment shownin Fi 3 is like the one in Fig. 2. However, in orderto insure the stability of the electrode assembly against distortiontransversely to the plane in which the lead- 55 ing-in wires lie,corrugations Ill and I II are formed in legs 3 and 3 oi the U. Thesecorrugations point in opposite directions at right angles totheplanethroughland 3. i

In the'structure shown in Fig. 4 the arrangement of Fig. 3 issubstantially duplicatedat I4, 5 i5, I, ll, corresponding to 3, 8, II,II. However.

. legs l4 and I! are connected with leading-in wires l2, l3. Legs l4 andII or I! and 13, or both,may be sealed in the walls of the glassenvelope. This arrangement is particularly useful in lamps re-' quiringcopper-clad leading-in wire or the like which is not rigid enough toserve as the sole electrode support or which can not be readily weldedto the electrode. i2 and I3 are such leading-in wires. Through two orthree steps welds, l8 and is, these leading-in wires may be secured tonickel, nickel alloy or the like wires l4,

I! which possess the necessary characteristics for acting as the soleelectrode support.

What is claimed 18! 2 1. In an electrode structure for electric'discharge device having an envelope, 9. metal cylinder, a U shaped wirethe connecting piece of which is secured to the cylinder and the twoless of which pass through and are sealed into the wall of the envelope,and a corrugation formed in each leg between the seal and the connectingpiece pointing in opposite directions at right angles to a plane passingthrough the legs.

2. In an electrode structure Ior electric discharge device having anenvelope, 9. metal cylinder, a U shaped wire the connecting piece ofwhich is flattened and fastened to the cylinder and the two legs ofwhich pass through and are sealed into the wall of the envelope, and acorrugation formed in each leg between the seal and the connecting piecepointing in opposite directions at right angles to a plane passingthrough the legs.

3. In an electrode structure for electric disv charge device having aglass tube envelope, a metal cylinder closed at one and open at theopposite end, a support for said cylinder consisting solely of a Ushaped wire of a metal that may be readily welded thereto, theconnecting piece of the U being flattened and welded at a plurality ofpoints to the closed end of the cylinder, the two legs of the U passingthrough and sealed into the 7 wall of the glass tube, and a corrugationformed in each leg between the seal and the connecting go piece pointingin opposite directions at right angles to a plane passing through thelegs.

4. In an electrode structure for anelectric discharge device having aglass tube envelope, a metal cylinder closed at one and open at the Iopposite end, a' support for said cylinder consisting solely or a. Ushaped wire of a metal that may be readily welded thereto, theconnecting piece of the U being flattened and welded at a plurality ofpoints to the closed end 01' the cylinder, and the two legs of the Upassing through and sealed into the wall 01' the glass tube, a.corrugation ionned'in each leg between the seal and the connecting piecepointing in opposite directions at right angles to a plane passingthrough the legs, leading-in wires of a. diflerent material, andmulti-ltep welds connecting the legs of the U with the leading-in wires.

JACOB KURTZ.

